Wagon-scale.



No. 720,728. PATENTED FEB. 17, 1903. B. T. MoDONALD, an. & J. M.MoDONALD. WAGON SCALE.

APPLICATION FILED DEC. 13, 1901.

3 SHEETS-SHEET 1.

10 MODEL.

Inventors,

% JMMf-j onazd, 7 9 g No. 720,728. PATENTED FEB. 17, 1903. B. T.MQDONALD, JR- & J. M. MGDONALD. WAGON SCALE.

APPLICATION FILED DEC. 13, 1901. .110 MODEL. 3 SHEETS-SHEET 2.

Q2. J T I I I Q lflllllllln Illll Q,

Witnesses, I22 van tors,

. 3111146". ,DonaZcL-J' J Mlle. Donald.

W. Z Z %@f 0W1 No. 720,728. Q PATENTED FEB. 17', 1903. 'B. T. McDONALD,JR. & J. M. MCDONALD. WAGON SCALE.

APPLICATION FILED DEG. 13, 190]. I 1T0 MODEL. 3 SHEETS-SHEET 3.

Witnesses, I 22 226;: tons,

B. T. McLDon aZc Z,

J M Mc. Donald Z W Z THE uonms'PsTEas co. Puo'ruumo. wuumsmu. a. c.

UNITED STATES PATENT OFFICE.

BENJIMAN T. MCDONALD, JR., AND JAMES M. MCDONALD, OF PLEASANT- HILL,MISSOURI.

WAGON-SCALE.

SPECIFICATION forming part of Letters Patent 1T0. 720,728, datedFebruary 17, 1903.

Application filed December 13, 1901. Serial No. 85,788. (No model.)

Zn all whom it may concern:

Be it known that we, BENJIMAN T. MoDoN- ALD, Jr., and JAMES M. MCDONALD,citizens of the United States, residing at Pleasanthill, in the countyof Cass and State of Missouri, have invented new and useful Improvementsin WVagon-Scales, of which the following is a specification.

Our invention relates to pitless wagonscales; and the objects of ourinvention are to produce a cheaper frame by substituting pipe for thecast-iron sides usually employed, to provide stronger supports for thehangerstirrups, and to provide simple means for supporting the ends ofthe platform-beams directly upon the rock-shaft lugs instead of byindirect connections employed heretofore.

We attain the abovenamed objects by means of the constructionillustrated in the accompanying drawings, in which- Figure 1 is a topplan view of a scale embodying our invention, the platform beingremoved. Fig. 2 is an enlarged elevation of one of the ends of thescale-frames. Fig. 3 is a further enlarged view of one of our improvedhanger-stirrups and its supports,showing also a portion of therock-shaft supported by the hanger-stirrup. Fig. 4 is a vertical sectiontaken on line IV IV of Fig. 3 looking in the direction of the arrows.Fig. 5 is an end elevation of one of the rock-shafts, .the end of theplatform-beam supported thereby, and the hanger-stirrup in section. Fig.6 represents the inner ends of the rock-shaft arms and their connectionswith the cross-lever, shown in section. Fig. 7 represents the inner endof the cross-lever and its connection with one of the platform-beams andone of the rock-shaft arms, the view being at a right angle from that inFig. 6. Figs. 8 and 9 are plan views of parts shown in Fig. 7 and willbe referred to hereinafter.

Referring to Fig. 1, the frame of the scale comprises two end castings 44, connected together by pipes 3 3. The ends of said pipes pass throughholes 2, Fig. 2, in the end castings'4 4 and are secured to theflattened ends of the end castings by nuts 5.

Each end casting 4 is constructed as shown in Fig. 2, in which 6designates integral crosswebs for bracing the casting.

Two of the 'the top of said bracket.

webs 6 are made heavier, as shown, and are provided with sockets 7 7,respectively, from which ribs 8 extend downwardly to provide solidsupport for said sockets. The top of each socket 7 is concaved, as shownin Fig. 4. Supported by the respective sockets 7 are thelaterally-projecting knife-edge lugs 9 of a hanger-stirrup 10. Formed inthe hangerstirrup 10 are two lugs 12, having concave uppersurfaces, onwhich rest knife-edge bearings 13, secured in a lug 14, cast on atubular rock-shaft 15. There being two hanger-stirrups 10 in each endcasting 4, the rock-shaft is provided with two lugs 14, supported bysaid hangers 10, respectively. At the opposite'end of the scale is asimilar rock-shaft 15, partially supported by hanger-stirrups 10,

. hung in the end casting 4.

lows: Bolted to each end of each beam 19 is a bifurcated bearing-block20, shaped as shown in side elevation in Fig. 5. Opposite each lug 14 onrock-shaft 15 is cast a lug 16, in which is fitted a knife-edgebearing-piece 21, projecting -from both sides of said lug 16.

The bifurcated sides of the bearing-block 2O straddle the lug 16 andrest on the bearingpiece 21, as shown.

Bolted to the middle of the outer side of one of the platform-beams 19is a bracket 22. (Shown enlarged in Fig. 7.) The function of bracket 22is to support the inner end of the cross-lever 18, which is providedwith knifeedge bearings 23, resting in concavities in The outer end ofthe cross-lever 18 is supported by a depending rod connected to ascale-beam. (Not shown.) Near its inner end the cross-lever 18 isprovided with knifeedge bearings 24, from which arehung,respectively,tw0 hangerstirrups 25. In the bottom of eachhangerstirrup 25 is a bearing-block 26, having a depression 27 in itsupper face. Fig. 9 is a plan view of one of these blocks. Secured in theend of each rocker-arm 17 is 2. depending studbolt 28, the lower end ofwhich rests in the depression 27 in one of the blocks 26. Bearingblocks29 are interposed between the knifeedge bearings 24 and the upperportions of hanger-stirrups 25. Fig.8isabott0m plan view of one of theseblocks 29. The effect of increasing the weight upon the platform-beams19 19 is to slightly rock the rock-shafts 15 15, which depress the innerends of the rockerarms 1'2, which pull down on the cross-lever 18,fulcrumed on the bracket 22, and thus the outer end of the cross-leveris depressed, it being connected to a scale-beam in the usual manner.

Having now fully described our invention, what we claim as new, anddesire to secure by Letters Patent of the United States, is-

1. In a wagon-scale frame, an end casting, a pair of upright websforming parts of said casting, bearing-sockets projecting toward eachother from said respective webs, and a hanger-stirrup havinglaterally-projecting bearing-lugs adapted to rest in or upon saidbearing-sockets, substantially as described.

2. In a wagon-scale, a frame including two end castings, a pair ofhanger-stirrups hung in each of said castings, a rock-shaft adjacent andparallel to each of said castings, lugs 14 on said rock-shafts, saidlugsbeing supported by said hanger-stirrups, lugs 16 on said rock-

